Lose 40 pounds in 4 months?

40 pounds is a lot to lose in just 4 months. that's over 2 pounds a week and losses aren't linear. BUT you can still achieve your goal of looking awesome on your wedding day even if you're a few pounds above your target!

i would recommend focusing on a reasonable deficit plugging in your numbers to mfp and setting for 2 lb per week goal, which is very aggressive but temporary (after your wedding you can set it up to 1 lb per week). I would also strongly suggest adding strength training to your regimen. It does more for your look aesthetically than crash dieting because you are losing inches while maintaining lean muscle mass. this prevents you from getting the skinny fat look. it may make your scale losses a bit slower and you want to make sure that you eat enough to fuel your body (regardless of whether you exercise or not), but overall i think if you focus on how you look and how you feel instead of the number on the scale you'll be more likely to succeed.

also, congrats on your loss and your wedding! i'm sure you'll look beautiful!

First congratulations! But yes that's very achievable! Just have to stick to your limit, eat healthy foods and work out. You will definitely see results. I've lost 85 lbs in about 5 months (I went from 341 to 255, so weight came off faster for me being i was so heavy)
But it sounds like you are going in the right direction, keep up the great work!